I can't give before and after because I install my fuel pressure gauge with the kit. Truck idles at 41 psi with 1/2 feed line stock
lp, that kit and a tork tek 020. I've never seen it below 25 psi with my benched 215 pump at 70 psi with a s369. I will most likely be looking into a check valve and a
lp spring upgrade next. I will snag a pic when I get a chance. It's 7° here.